package com.wwwarehouse.common.tripartite_widget.zxing;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;

import com.google.zxing.BarcodeFormat;
import com.wwwarehouse.common.R;
import com.wwwarehouse.common.activity.CaptureActivity;

import java.util.Vector;

/**
 * This class handles all the messaging which comprises the state machine for
 * capture.
 */
public final class CaptureActivityHandler extends Handler {

	private CaptureActivity captureActivity;
	private DecodeThread decodeThread = null;
	private State state;

	private enum State {
		PREVIEW, SUCCESS, DONE
	}

	public CaptureActivityHandler(Activity activity, Vector<BarcodeFormat> decodeFormats, String characterSet) {
		captureActivity = (CaptureActivity) activity;
		decodeThread = new DecodeThread(activity, decodeFormats, characterSet, new ViewfinderResultPointCallback(captureActivity.getViewfinderView()));

		decodeThread.start();
		state = State.SUCCESS;
		// Start ourselves capturing previews and decoding.
		CameraManager.get().startPreview();
		restartPreviewAndDecode();
	}

	@Override
	public void handleMessage(Message message) {
		if (message.what == R.id.auto_focus) {
			if (state == State.PREVIEW) {
				CameraManager.get().requestAutoFocus(this, R.id.auto_focus);
			}
		}
		else if (message.what == R.id.restart_preview) {
			restartPreviewAndDecode();
		}
		else if (message.what == R.id.decode_succeeded) {
			state = State.SUCCESS;
			Bundle bundle = message.getData();
			Bitmap barcode = bundle == null ? null : (Bitmap) bundle
					.getParcelable(DecodeThread.BARCODE_BITMAP);
			captureActivity.handleDecode((com.google.zxing.Result) message.obj, barcode);
		}
		else if (message.what == R.id.decode_failed) {
			state = State.PREVIEW;
			CameraManager.get().requestPreviewFrame(decodeThread.getHandler(), R.id.decode);
		}
		else if (message.what == R.id.return_scan_result) {
			captureActivity.setResult(Activity.RESULT_OK, (Intent) message.obj);
			captureActivity.finish();
		}
		else if (message.what == R.id.launch_product_query) {
			String url = (String) message.obj;
			Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
			intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
			captureActivity.startActivity(intent);
		}
	}

	public void quitSynchronously() {
		state = State.DONE;
		CameraManager.get().stopPreview();
		Message quit = Message.obtain(decodeThread.getHandler(), R.id.quit);
		quit.sendToTarget();
		try {
			decodeThread.join();
		} catch (InterruptedException e) {
			// continue
		}

		removeMessages(R.id.decode_succeeded);
		removeMessages(R.id.decode_failed);
	}

	private void restartPreviewAndDecode() {
		if (state == State.SUCCESS) {
			state = State.PREVIEW;
			CameraManager.get().requestPreviewFrame(decodeThread.getHandler(),
					R.id.decode);
			CameraManager.get().requestAutoFocus(this, R.id.auto_focus);
			captureActivity.drawViewfinder();
		}
	}

}
